Alkanes, Alkenes and Cracking
- Created by: claudiadavey
- Created on: 11-12-15 18:25
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- Alkanes and Alkenes
- Cracking
- Some of the long-chain hydrocarbons obtained through fractional distillation are not very useful
- Cracking is a process we can use to break them down into more useful small-chain molecules
- To crack a hydrocarbon, its vapours are passed over a catalyst at around 500°C
- Cracking produces a short-chain alkane and seperate alkenes
- Cracking also occurs when hydrocarbons are mixed with steam and heated to a high temperature
- The hydrocarbon thermally decomposes
- Some of the long-chain hydrocarbons obtained through fractional distillation are not very useful
- Alkanes
- Have a general formula of CnH2n+2
- Contain no double bonds- are saturated
- Doesn't change bromine water
- First five are methane, ethane, prpane, butane and pentane
- Alkenes
- Have a general formula of CnH2n
- Have at least one double carbon bond- are unsaturated
- Turn bromine water colourless
- First five are methene, ethene, propene, butene and pentene
- Cracking
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